71% (1996)

61% (2000)

68% (2006)

66% (2005)

74% (2002)

63% (2008)

76% (2003)

77% (2001)

69% (2001)

59% (2008)

56% (2004)

70% (2003)

68% (2002)

62% (2005)

54% (2006)

65% (1998)